If you're in the Los Angeles area, go to the iam8bit show in Hollywood.
It's free to browse through the gallery, and it's full of awesome stuff, and it's open Thursdays, Fridays, and Saturdays from 11 am to 6 pm. All the main art is way too expensive, but they usually have a bin over by the counter with smaller prints for cheap. In 2006 they had a bunch of prints of Brandon Bird's "Nobody Wants to Play Sega with Harrison Ford" for like $20 or something.
Sadly I can't make it this year, but they put all their work up in a photobucket album for the rest of us bums!
Click on this magic to get to the gallery.